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Save the DNS lookup for K.root-servers.net (Thanks barfoos)

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This avoids running into a timeout when there is no connectivity on
i3status startup.
This commit is contained in:
Michael Stapelberg 2012-09-29 00:08:56 +02:00
parent 59d52ad787
commit 5c615f7074
1 changed files with 7 additions and 4 deletions
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11
src/print_ipv6_addr.c
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@ -78,10 +78,13 @@ static char *get_ipv6_addr(void) {
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_DGRAM;
/* We resolve the K root server to get a public IPv6 address. You can
* replace this with any other host which has an AAAA record, but the
* K root server is a pretty safe bet. */
if (getaddrinfo("k.root-servers.net", "domain", &hints, &result) != 0) {
/* We use the public IPv6 of the K root server here. It doesn’t matter
* which IPv6 address we use (we don’t even send any packets), as long
* as it’s considered global by the kernel.
* NB: We don’t use a hostname since that would trigger a DNS lookup.
* By using an IPv6 address, getaddrinfo() will *not* do a DNS lookup,
* but return the address in the appropriate struct. */
if (getaddrinfo("2001:7fd::1", "domain", &hints, &result) != 0) {
/* We don’t display the error here because most
* likely, there just is no connectivity.
* Thus, don’t spam the user’s console. */